Blade holder

ABSTRACT

A blade holder for a handsaw construction including a saw frame having a handle at the rear end thereof and a leg at the front end thereof, a link pivotally mounted at one end thereof upon the frame spaced from the leg, means at the other end of the link for securing thereto the rear end of a saw blade, means for adjusting the space between the other end of the link and the leg, and a blade holder having two clamping members hingedly interconnected for clamping the front end of a saw blade, a retainer member mounted on the leg for engaging the clamping members to hold them in the clamping position thereof. One-piece and two-piece clamping members, rectangular and tapered clamping members and synthetic organic resin clamping members are disclosed. The clamping member may have mounted thereon a trapping member which in use extends through the retaining member to maintain association between the clamping members and the retaining member.

United States Patent Dreier [54] BLADE HOLDER [72] Inventor: Raymond C. Dreier, 3450 N. Lakeshore Drive, Chicago, 111. 60657 22 Filed: Jan. 11,1971

211 Appl.No.: 105,341

[52] US. Cl. ..145/33 A [51] Int. Cl. ..B27b 21/06 [58] Field of Search ....145/33 R, 33 A, 33 AB, 34 R,

Primary ExaminerRobert C. Riordon Assistant Examiner-Roscoe V. Parker, Jr. Attorney-Prangley, Clayton, Mullin, Dithmar & Vogel [451 Nov. 14, 1972 ABSTRACT A blade holder for a handsaw construction including a saw frame having a handle at the rear end thereof and a leg at the front end thereof, a link pivotally mounted at one end thereof upon the frame spaced from the leg, means at the other end of the link for securing thereto the rear end of a saw blade, means for adjusting the space between the other end of the link and the leg, and a blade holder having two clamping members hingedly interconnected for clamping the front end of a saw blade, a retainer member mounted on the leg for engaging the clamping members to hold them in the clamping position thereof. One-piece and twopiece clamping members, rectangular and tapered clamping members and synthetic organic resin clamping members are disclosed. The clamping member may have mounted thereon a trapping member which in use extends through the retaining member to maintain association between the clamping members and the retaining member.

15 Clairm, 9 Drawing Figures Emmtnmv 14 m2 SHEET 1 OF 2 INVEN TOR RA YMOND C. DRE/ER ATTYS.

. BLADE HOLDER This invention is directed to an improved handsaw in which a novel blade holder is provided and more specifically to a handsaw having a blade holder including two clamping members hingedly interconnected and a retainer member for engaging the clamping members to hold them in the clamping position thereof.

It is an important object of this invention to provide a handsaw comprising a longitudinally extending saw frame including a handle at the rear end thereof and a leg at the front end thereof,a link pivotally mounted at one end thereof upon the frame spaced from the leg and extending in the same direction as the handle and the leg, means at the other end of the link for securing thereto the rear end of a saw blade, means for adjusting the space between the other end of the link and the leg, and a blade holder including two clamping members hingedly interconnected for clamping the front end of the saw blade, a retainer member mounted on the leg for engaging the clamping members to hold them in the clamping position thereof, whereby when the front end of the saw blade is held between'the clamping members, the adjusting means may be operated to pivot the link away from the blade holder to tighten the blade therebetween.

Another object of the present invention is to provide a handsaw of the type set forth in which the clamping members have cooperating taperedsurfaces thereon mating with complementary tapering surfaces on the retainer member when the clamping members are in engagement with the retainer member, whereby the adjusting means may be operated to tighten the blade and further to tighten the clamping members within the retainer member.

A further object of the present invention is to provide a handsaw of the type set forth in which a trapping member is mounted on one of the clamping members for engaging the retainer member when the clamping members are in the unclamping position thereof and spaced from the retainer member, whereby when the clamping members are not holding the front end of a saw blade, the trapping member may engage the retainer member to maintain association between the clamping members, and the retainer member.

The invention, both as to its organization and method of operation, together with further objects and advantages thereof, will best be understood by reference to the following specification considered in connection with the accompanying drawings, in which:

FIG. 1 is an felevational side view of a handsaw embodying the principles of the present invention, wherein the saw blade is tensioned and ready for use;

FIG. 2 is an enlarged elevational end view of the lefthand portion of the handsaw illustrated in FIG. 1, viewed in the direction of line 2-2 thereof;

FIG. 3 is an elevational side view of the handsaw illustrated in FIG. 2 viewed along the line 33 thereof;

FIG. 4 is a top plan view of the portion of the handsaw illustrated in FIG. 3 viewed along the line 4-4 thereof;

FIG. 5 is an elevationalview partly in cross section of the left-hand portion of the handsaw illustrated in FIG. 2 showing the trapping member in phantom disposed within the retaining member in its angular or withdrawing position;

FIG. 6 is an elevational end view of the left-hand portion of a handsaw as illustrated in FIG. 1, showing the saw blade and clamping members thereof rotating with respect to FIG. 1;

FIG. 7 is an enlarged perspective view of a tapered blade holder;

FIG. 8 is an enlarged perspective view of a one-piece clamping member and tapping member; and

FIG. 9 is a top plan view partly in cross section of the one-piece clamping members and trapping member illustrated in FIG. 8.

Referring now to FIG. 1 of the drawings, there is illustrated a handsaw including a saw frame having a C-shaped handle at the rear end of the handsaw 100, the C-shaped handle 110 including a grip portion 111 having a web 112 bounded on either side thereof by laterally extending flanges 113. The handle 110 has at the forward end thereof a cylindrical boss into which fits one end of a tubular frame member 1 16, the other end of the tubular member 116 fitting into a cylindrical boss 118 of a front frame member 1 17. The saw frame 105 further includes a leg 119 extending in the same direction from the tubular frame member 1 16 as the handle 110.

At the end of the leg 119 away from the cylindrical boss 118 is mounted a retaining member of a blade holder 120. The retaining member 125, as best seen in FIGS. 3 to 5, is formed of two spaced apart, generally parallel outer side walls 126, a top wall 127 connecting the outer side walls 126, a bottom wall 128 spaced from and parallel to the top wall 127. Also interconnecting the outer side walls 126, there is provided a front face 129 generally intersecting the outer side walls 126, the top wall 127, and the bottom wall 128, perpendicularly and a rear face 130 spaced from the front face 129 toward the handle 110. The retaining member 125 has a tapered aperture 132 extending therethrough from the front face 129 to the rear face 130, the interior surface 133 of the tapered aperture 132 being comprised of two sets of complementary opposed surfaces, the larger end of the aperture 132 being at the front face 129 and the smaller end of the tapered aperture 132 being at the rear face 130.

Returning now to FIG. 1, there are disposed two spaced apart and generally parallel ears 137 extending from the handle 110 near the cylindrical boss 114, theears 137 forming a vertical slot 138 therebetween. A link 139 is mounted on a rivet 140 extending laterally through the ears 137 pivotally to mount the link 139 on the handle 110 to allow movement of the link 139 toward and away from the leg 119 and the blade holder 120 associated therewith.

The end of the link 139 away from the rivet 140 is provided with a convex slot 141 extending laterally through the link 139 and a cylindrical passage 142 extending longitudinally of the plane formed by the handle 110, the leg 119 and the link 139, the cylindrical passage 142 intersecting the convex slot 141 at right angles. The slot 141 has loosely located therein a square nut 143, the dimensions of the slot 141 being such that opposed peripheral walls of the nut 143 loosely engage the walls of the slot 141 toward and away from the rivet 140 to prevent rotational movement of the nut 143 about its axis while the convex walls of the slot 141 prevent movement of the nut 142 in an axial direction. The convex nature of the slot 141 permits limited tilting movement of the nut 143 within the slot.

A shaft 144, having one end thereof loosely extending through the cylindrical passage 142, is threaded into and through the nut 143 and extends from the link 139 rearwardly, where the rearwardmost end of the shaft 144 is loosely received within a cylindrical opening 145 formed in the end of the C-shaped handle 110 away from the boss 114, the cylindrical opening 145 being substantially coaxial with the cylindrical passage 142 in the link 139. Similar to the link 139, the handle 1 has a transverse slot 146 formed therein intersecting the cylindrical opening 145 substantially at right angles and has located therein a square nut 147. The transverse slot 146 is of a size'to prevent rotation of the nut 147 as well as to prevent axial movement of the nut within the slot 146. The nuts 143 and 147 are provided with oppositely directed threads, the nut 143, for instance, being provided with right-hand threads corresponding to the threads on the forward end of the shaft 144, the nut 147 being provided with left-hand threads corresponding to the threads on the rearward end of the shaft 144.

At approximately the center of the shaft 144, there is fixed thereon a cylindrical knurled adjusting member 148, the rotation of which will cause the shaft 144 to rotate in the nuts 143 and 147, thereby pivoting the link 139 with respect to the leg 1 19 and the handle 110. The end of the link 139 away from the rivet 140 is provided with an outwardly and slightly rearwardly directed blade receiving pin 149 and a similar blade receiving pin 150 projects laterally of the link 139 adjacent the adjusting member 148.

There is illustrated particularly in FIGS. 3, 4 and 7, two clamping members 161 and 162 of the blade holder 120, the clamping member 161 having a front face 164 and a rear face 165 generally parallel to and spaced from the front face 164 toward the handle 110 of the handsaw 100. The clamping member 161 further includes a top face 166 and a bottom face 167, the top face 166 and the bottom face 167 being tapered so as to converge toward each other toward the intersection thereof by the rear face 165. The clamping member 161 is provided with an inner face 168 interconnecting the front face 167, the rear face 165, the top face 166 and the bottom face 167, the inner face 168 being trapezoidal in shape with the intersection of the front face 164 and the rear face 165 therewith being parallel. There is further provided in the approximate center of the inner face 168 of the clamping member 161 a nipple 170 extending normally from the face 168. The clamping member 161 is also provided with a hinge member 173 located in the middle of the front face 164 and being generally triangular in plan view and having an arcuate surface through which extends an aperture 174 having a purpose hereinafter explained.

The clamping member 162 has a front face 184 and a rear face 185 generally parallel thereto and spaced therefrom toward the handle 110. The clamping member 162 is further provided with a top face 186 and a bottom face 187, the top face 186 and the bottom face 187 converging toward each other from the intersections thereof with the front face 184 to the intersections thereof with the rear face 185. The clamping member 162 is further provided with an inner face 188 complementary in shape to the inner face 168 of clamping member 161. At the approximate center of the inner face 188 of the clamping member 162, there is provided a dimple 190 for receiving therein the nip ple 170 of the clamping member 161 when the clamping members 161 and 162 are in the clamping position thereof, as will be hereinafter explained. The dimple 190 is of sufficient depth to permit closing of the clamping members 161 and 162 to a distance less than the thickness of an associated saw blade, such as 205.

The clamping member 162 is further provided with a pair of parallel and spaced apart ears 193, each of the ears 193 having an aperture 194 therein, the apertures 194 in each of the ears and the aperture 174 in the hinge member 173 being coaxial when the clamping members 161 and 162 are in the assembled position thereof to accept through the apertures 174 and 194, a rivet 195, thereby hingedly to interconnect clamping member 161 with clamping member 162.

The clamping member 162 is further provided with a trapping member 200, the trapping member 200 generally being T-shaped and having two pins 201 extending outwardly from a tongue portion 202, the tongue portion 202 being mounted on the rear face 185 of the clamping member 162. The tongue portion 202 has an inner face 203 which extends from and in the same plane as the inner face 188 of the clamping member 162. The trapping member 200 may be integral with and formed as one piece with the clamping member 162 or may be separately assembled and mounted to the rear face 185 of the clamping member 162. The dimensions of the two pins 201 are such that the trapping member 200 may be inserted through the tapered aperture 132, thereby to maintain spatial association between the clamping members 161 and 162 and retaining member when the clamping members 161 and 162 are in the unclamping position thereof as will hereinafter be explained.

Reference to FIG. 7 shows the clamping member 161 and 162 in the unclamping position thereof in which the inner surfaces 168 and 188, respectively, are spaced apart to receive a saw blade 205 therebetween, the saw blade 205 being provided with an aperture 206 through which passes the nipple 170. When the clamp ing member 161 is moved in the direction of arrow 210 to place the nipple 170 through the aperture 206 in the saw blade 205 and into the dimple 190, the clamping members 161 and 162 are thereby placed in the clamping position thereof. The two clamping members 161 and 162 in the clamping position thereof and with the saw blade 205 positioned therebetween are moved into the retainer member 125 firmly to contact the outer periphery of the clamping members 161 and 162 with the inner surface 133 of the tapered aperture 132 firmly to hold the clamping members 161 and 162 in the clamping position thereof.

The saw blade 205 may be mounted, as shown in FIG. 1, in the plane formed by the handle 110, the leg 119, the tubular frame 116 and the link 139 or the blade 205 may be mounted in a plane 90 therefrom, as shown in FIG. 6, wherein the pin 149 would be utilized to retain the rear end of the blade 205 in that position. The pin is utilized to maintain the blade 205 in the position illustrated in FIG. 1. As the rear faces and 185 of the clamping members 161 and 162, respectively, are substantially square when in the clamping position thereof, the clamping members 161 and 162 snugly fit within the retainer member 125 in either the position shown in FIGS. 1 and 2 or the position shown in FIG. 6, it being noted that an advantage of the present invention is that the'blade holder 120 will accommodate a saw blade 205 in either of the two planes described. I

Operation of the handsaw 100 is as follows, the clamping members 161 and 162 are maintained in their unclamping position, and thereafter a blade 205 is positioned in abutting relationship to the inside surface 188 I of the clamping member 162 with the aperture 206 in registry with the dimple 190. Thereafter, the clamping members 161 and 162 are moved into the clamping position thereof wherein the nipple 170 extends through the aperture 206 and into the dimple 190 and the inside face 168 of the clamping member 161 abuts the saw blade 205. The clamping member 161 and 162 with the saw blade 205 therebetween are moved rearwardly toward the handle 110 until the'clamping members 161 and 162 snugly fit within the tapered aperture 132 of the retainer member 125. The rear end of the blade 205 having an aperture (notshown) therein is mounted on pin 149 or 150 depending on whether the blade 205 is desired to be mounted as shown in FIG. 6 or FIG. 2, respectively. In order to increase tension in the blade 205, the adjusting member 148 is rotated in a direction to pivot the link 139 away from the leg 119 and toward the handle 110. Once the blade 205 has been tensioned, the handsaw 100 is ready for use.

, When it is desired to change blades the adjusting member 148 is rotated in the opposite direction thereby to pivot the link 139 toward the leg 119 and away from the handle 110 to release tension in the blade 205 and allow removal thereof from the pin 149 or 150. Thereafter, the clamping members 161 and 162 may be moved out of engagement with the retainer member 125 and to the unclamping position thereof, thereby to permit changing of the blade 205.

There is further provided, as illustrated in FIGS. 8 and 9, a second embodiment of the blade holder 120. The blade holder 220, there illustrated, is of a onepiece construction in which a clamping member 162 and a clamping member 262 are integrally connected, the clamping member 261 having a front face 264 and a rear face 265 spaced therefrom. The clamping member 261 further includes a top face 266 and a bottom face l67,the top face 266 and the bottom face 267 being tapered so as to converge toward each other and toward the rear face 265. The clamping member 261 also includes a trapezoidal inner face 268 provided with a nipple 270 generally located in the center of the inner face 268 and extending outwardly therefrom.

The clamping member 262 is connected to the clamping member 261 as by hinge 275, the hinge 275 being a portion integral with the clamping members 261 and 262 but being of reduced thickness as compared with the clamping members 261 and 262. The clamping member 262 is provided with a front face 284, a rear face 285, a top face 286 and a bottom face 287, the faces 286 and 287 being tapered so as to converge toward each other and toward the rear face 285. The top face 286 and the bottom face 287 and the rear face 285 form at their intersections, an inner face 288 of the clamping member 262, the inner face 288 of the clamping member 262 being trapezoidal in form and shaped complementary to the inner face 268 of the clamping member 261. Inthe center of the inner face 288 of clamping member 261, there is provided a dimple 290, the dimple 290 being of sufiicient size to receive therein the nipple 270 when the clamping members 261 and 262 are moved from their uncla'rnping positions, as shown in FIG. 8, in the direction of the arrow 310 tothe clamping'position thereof in which a saw blade such as 205 is held therebetween and the dimple 290 receives therein the nipple 270.

A trapping member 300 is connected to the clamping member 262, and in particular, the trapping member 300 is T-shaped and has a pair of outwardly extending pins 301 at the distal end of a tongue 302 mounted upon the rear face 285 of the clamping member 262. The trapping member 300 has an inner face 303 which extends from and is in the same plane as the inner face 288 of the clamping member 262. The clamping members 261 and 262 and the corresponding trapping member 300 operate in the same manner and cooperate with a corresponding retainer member (not shown) as do the clamping members 161 and 162 and retainer member 125. It is noted that the retainer member (not shown) which cooperates with the clamping members 261 and 262 would have a tapered aperture therein as was previously shown, i. e., an aperture with the inner surface thereof shaped to receive and to hold the clamping members 261 and 262 in the blade clamping position thereof.

As is seen in FIGS. 8 and 9, there has been provided a one-piece blade holder 220 in which the clamping members 261 and 262 are hingedly connected as at 275 with the trapping member 300 being integrally formed from one of the clamping members 261 and 262. A synthetic organic resin such as polypropylene readily may be used to form a blade holder 220 of the type here illustrated. Operation of the handsaw with a blade holder 220 therein is the same as described above when using the blade holder 120. g

It will be observed that there has been provided an improved handsaw having a blade holder including clamping members, a retainer member and a trapping member embodying all the objects and advantages set forth herein. While there has been described what is at present considered to be the preferred embodiment of the invention, it will be understood that various modifications may be made therein, and it is intended to cover in the appended claims all such modifications as fall within the true spirit and scope of the invention.

What is claimed is:

1. A handsaw comprising a longitudinally extending saw frame including a handle at the rear end thereof and a leg at the front end thereof, a link pivotally mounted at one end thereof upon said frame spaced from said leg and extending in the same direction as said handle and said leg, means at the other end of said link for securing thereto the rear end of a saw blade, means for adjusting the space between the other end of said link and said leg, a blade holder including two clamping members hingedly interconnected for clamping the front end of a saw blade, a retainer member mounted on said leg for engaging said clamping members to hold them in the clamping position thereof, and a trapping member mounted on one of said clamping members for engaging said retainer member when said clamping members are in the unclamping position thereof, whereby when the front end of the saw blade is held by said clamping members, said adjusting means may be operated to pivot said link away from said blade holder to tighten the blade therebetween and when said clamping members are not holding the front end of a saw blade, said trapping member may engage said retainer member to maintain spatial association between said clamping members and said retainer member.

2. The handsaw set forth in claim 1, wherein said means for adjusting the space between the other end of said link and said leg interconnects said link with said handle.

3. The handsaw set forth in claim 1, wherein said clamping members are separatable and are hingedly interconnected by pivot means.

4. The handsaw set forth in claim 1, wherein said clamping members are formed from one piece of a synthetic organic resin.

5. The handsaw set forth in claim 1, wherein said clamping members are formed from one piece of a polypropylene synthetic organic resin.

6. The handsaw set forth in claim 1, wherein one of said clamping members has a nipple extending therefrom for passing thru an aperture in the front end of a saw blade when the saw blade is held by said clamping members in the clamping position thereof, and the other of said clamping members has a dimple therein for receiving said nipple when said clamping members are in the clamping position thereof.

7. The handsaw set forth in claim 1, wherein said retaining member and said leg are one piece.

8. The handsaw set forth in claim 1, wherein said blade holder and said blade securing means are adapted to hold therebetween a blade in the plane of said frame.

9. The handsaw set forth in claim 1, wherein said blade holder and said blade securing means are adapted to hold therebetween a blade lying in a plane 90 from the plane of said frame.

10. A handsaw comprising a longitudinally extending saw frame including a handle at the rear end thereof and a leg at the front end thereof, a link pivotally mounted on one end thereof upon said frame spaced from said leg and extending in the same direction as said handle and said leg, means at the other end of said link for securing thereto the rear end of a saw blade, means for adjusting the space between the other end of said link and said leg, a blade holder including two clamping members hingedly interconnected for clamping the front end of a saw blade, a retainer member mounted on said leg for engaging said clamping members to hold them in the clamping position thereof, said clamping members having cooperating tapered surfaces thereon mating with complementary tapering surfaces on said retainer member when said clamping members are in engagement with said retainer member and a trapping member mounted on one of said clamping members for engaging said retainer member when said clamping members are in the unclamping position thereof, whereb when the front end of the saw blade is held by said c amping members and between said cooperating tapered surfaces thereof, said adjusting means may be operated to pivot said link away from said blade holder to tighten the blade therebetween and further to tighten the clamping members within said retainer member.

11. The handsaw set forth in claim 1, wherein said trapping member is a T-shaped member.

12. The handsaw set forth in claim 1, wherein said trapping member is adapted freely to pass thru said retainer member when said trapping member is in one angular position with respect thereto and said trapping member is adapted to engage said retainer member when said trapping member is in another angular position with respect thereto.

13. The handsaw set forth in claim 1, wherein said clamping members and said trapping member are one piece of synthetic organic resin.

14. The handsaw set forth in claim 1, wherein said clamping members and said trapping member are one piece of a polypropylene synthetic organic resin.

15. The handsaw set forth in claim 1, wherein said retainer member has an aperture therethrough square in cross section, said trapping member is T-shaped with a dimension such that said trapping member passes thru the aperture in said retainer member when said trapping member is in a diagonal position with respect to the aperture and said trapping member engages said retainer member when said trapping member is in a position other than a diagonal with respect to said retainer member. 

1. A handsaw comprising a longitudinally extending saw frame including a handle at the rear end thereof and a leg at the front end thereof, a link pivotally mounted at one end thereof upon said frame spaced from said leg and extending in the same direction as said handle and said leg, means at the other end of said link for securing thereto the rear end of a saw blade, means for adjusting the space between the other end of said link and said leg, a blade holder including two clamping members hingedly interconnected for clamping the front end of a saw blade, a retainer member mounted on said leg for engaging said clamping members to hold them in the clamping position thereof, and a trapping member mounted on one of said clamping members for engaging said retainer member when said clamping members are in the unclamping position thereof, whereby when the front end of the saw blade is held by said clamping members, said adjusting means may be operated to pivot said link away from said blade holder to tighten the blade therebetween and when said clamping members are not holding the front end of a saw blade, said trapping member may engage said retainer member to maintain spatial association between said clamping members and said retainer member.
 2. The handsaw set forth in claim 1, wherein said means for adjusting the space between the other end of said link and said leg interconnects said link with said handle.
 3. The handsaw set forth in claim 1, wherein said clamping members are separatable and are hingedly interconnected by pivot means.
 4. The handsaw set forth in claim 1, wherein said clamping members are formed from one piece of a synthetic organic resin.
 5. The handsaw set forth in claim 1, wherein said clamping members are formed from one piece of a polypropylene synthetic organic resin.
 6. The handsaw set forth in claim 1, wherein one of said clamping members has a nipple extending therefrom for passing thru an aperture in the front end of a saw blade when the saw blade is held by said clamping members in the clamping position thereof, and the other of said clamping members has a dimple therein for receiving said nipple when said clamping members are in the clamping position thereof.
 7. The handsaw set forth in claim 1, wherein said retaining member and said leg are one piece.
 8. The handsaw set forth in claim 1, wherein said blade holder and said blade securing means are adapted to hold therebetween a blade in the plane of said frame.
 9. The handsaw set forth in claim 1, wherein said blade holder and said blade securing means are adapted to hold therebetween a blade lying in a plane 90* from the plane of said frame.
 10. A handsaw comprising a longitudinally extending saw frame including a handle at the rear end thereof and a leg at the front end thereof, a link pivotally mounted on one end thereof upon said frame spaced from said leg and extending in the same direction as said handle and said leg, means at the other end of said link for securing thereto the rear end of a saw blade, means for adjusting the space between the other end of said link and said leg, a blade holder including two clamping members hingedly interconnected for clamping the front end of a saw blade, a retainer member mounted on said leg for engaging said clamping members to hOld them in the clamping position thereof, said clamping members having cooperating tapered surfaces thereon mating with complementary tapering surfaces on said retainer member when said clamping members are in engagement with said retainer member and a trapping member mounted on one of said clamping members for engaging said retainer member when said clamping members are in the unclamping position thereof, whereby when the front end of the saw blade is held by said clamping members and between said cooperating tapered surfaces thereof, said adjusting means may be operated to pivot said link away from said blade holder to tighten the blade therebetween and further to tighten the clamping members within said retainer member.
 11. The handsaw set forth in claim 1, wherein said trapping member is a T-shaped member.
 12. The handsaw set forth in claim 1, wherein said trapping member is adapted freely to pass thru said retainer member when said trapping member is in one angular position with respect thereto and said trapping member is adapted to engage said retainer member when said trapping member is in another angular position with respect thereto.
 13. The handsaw set forth in claim 1, wherein said clamping members and said trapping member are one piece of synthetic organic resin.
 14. The handsaw set forth in claim 1, wherein said clamping members and said trapping member are one piece of a polypropylene synthetic organic resin.
 15. The handsaw set forth in claim 1, wherein said retainer member has an aperture therethrough square in cross section, said trapping member is T-shaped with a dimension such that said trapping member passes thru the aperture in said retainer member when said trapping member is in a diagonal position with respect to the aperture and said trapping member engages said retainer member when said trapping member is in a position other than a diagonal with respect to said retainer member. 